Acid damaged black limestone patio tiles in Bromsgrove

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Acid damaged black limestone patio tiles in Bromsgrove

A local company in Bromsgrove were commissioned to lay a stunning and expensive Black Limestone patio for a customer who was renovating their property. Unfortunately, the company tried to clean the finished patio with brick acid, and because limestone is generally very porous and acid sensitive this discoloured the tiles to a rather unsightly, dull grey – a far cry from what their customer was expecting!

The company facing a large bill contacted Tile Doctor for expert advice to see if the beautiful tiles could be restored. If Tile Doctor couldn’t come to the rescue, then the company would have no choice other than to replace them at their own expense.

Black limestone paving has become incredibly popular over the last few years as its dark tones suit the current trend for a monochrome palette. It is also hard wearing and readily available.

Tile Doctor specialise in the restoration of all types of tile and stone and as their local agent, I was asked to go over and see what could be done. I realised that the brick acid will have damaged the surface of the stone so to restore it I first tried applying a coarse 200 grit diamond burnishing pad. The pad successfully demonstrated that the appearance could be restored and impressed with the difference the site foreman booked me in to complete the whole patio. Luckily the weather forecast was set fair for a few days, which would be needed to clean and seal the patio.

Restoring an Acid Damaged Limestone Patio
Made with industrial diamonds and available in different sizes and grits, burnishing pads are ideal for restoring the appearance of polished stone floors. The first step was to work on the tiles with a course 200 grit diamond pad fitted to a weighted rotary machine and lubricated with water. This took off a layer of the limestone, bringing back the original black appearance of the tiles.

Next the patio was worked on with 400 grit diamond pads followed by 800 grit pads – the first stage of polishing – and each application was cleaned off with water. Because the property was being renovated there was a lot of dirt on the tiles and grout from construction, so I scrubbed in medium dilution of Tile Doctor Pro-Clean using a CRB (counter rotating brush) machine. Once done I rinsed down the area with more water and left it to dry. As you can see from the pictures it was a large area, so this work took two days to complete.

Sealing Limestone Patio Tiles to Restore Colour
I returned the next day to start the sealing process beginning with the application of Tile Doctor Stone-Oil which restores the deep black colour and texture to the limestone, it’s also an impregnating sealer that adds protection and improves mechanical strength once cured.

I allowed this to dry for 24 hours and then applied a coat of Ultra-Seal, a no-sheen natural-looking sealer formulated to provide maximum stain protection.

The customer was very happy with the results. The patio tiles were fully restored to their original glory and their customer was delighted. More importantly, the company had been saved from making an insurance claim. They left the following feedback on completion:

“Great job by Kieron after the wrong cleaning solution was used on a patio we installed. Came up better than new!”

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